flutter_nav_tut

.\lib\main.dart

import 'package:flutter/material.dart';

import 'package:flutter_tut_navigation/content.dart';
import 'package:flutter_tut_navigation/newPage.dart';

void main() => runApp(Main());

class Main extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Navigation Tutorial',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MainPage(),
      // Here will be some code
    );
  }
}

class MainPage extends StatefulWidget {
  @override
  _MainPageState createState() => _MainPageState();
}

class _MainPageState extends State<MainPage> {
  int _currentIndex = 0;

  final List<Widget> _children = [
    ContentPage(title: "Home Page"),
    ContentPage(title: "Messages Page"),
    ContentPage(title: "Profile Page")
  ];

  void _onBottomNavBarTab(int index) {
    setState(() {
      _currentIndex = index;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Flutter Navigation Tutorial"),
      ),
      body: _children[_currentIndex],
      bottomNavigationBar: BottomNavigationBar(
        currentIndex: _currentIndex,
        onTap: _onBottomNavBarTab,
        items: [
          BottomNavigationBarItem(
            icon: Icon(Icons.home),
            title: Text('Home'),
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.mail),
            title: Text('Messages'),
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.person),
            title: Text('Profile'),
          )
        ],
      ),
      drawer: Drawer(
        child: ListView(
          children: <Widget>[
            UserAccountsDrawerHeader(
                accountName: Text('Max'), accountEmail: Text('max@email.com')),
            // Here will be some code
          ],
        ),
      ),
    );
  }
}